Texas Instruments DC-DC Converter

A Texas Instruments evaluation module featuring a 10-W off-line discontinuous mode (DCM) flyback converter that provides constant-voltage (CV) and constant-current (CC) output regulation without the use of an opto-coupler. The UCC28730 controller uses primary-side regulation (PSR) and detects a wake-up signal from the UCC24650 secondary-side voltage-droop monitor improving the response to large changes in load. The module demonstrates how the UCC28730 can provide ultra-low standby power without sacrificing start-up time or output transient response.

• No-load power consumption less than 5mW
• Primary side regulation eliminates opto-coupler
• Wake-up detection helps minimize no-load switching frequency and output capacitance
• ±5% Output voltage and current regulation
• Resonant ring valley switching operation for highest overall efficiency

Flyback Controllers, Texas Instruments

Current-Mode and Voltage-Mode PWM Controller
Primary-Side Regulation
Peak Power Mode
Low Power